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Journal Article

Finite Element Analysis Simulation of a Fireproof Test for an Aircraft Propulsion Engine Mount Structure Made of Titanium

Aviation regulations requires that engine mounts, and other flight structures located in designated fire zones must be constructed of fireproof material so that they are capable of withstanding the effects of fire. Historically, steel is defined as being inherently fireproof, however, titanium was not. Therefore, a fireproof test was conducted using 6AL-4V titanium structure for the attachment of the propulsion system on a mid-size business jet to satisfy FAA Federal Aviation Requirement 25.865. To determine if the titanium structure would be able to support normal operating loads during the fire event, finite element analysis was performed on the titanium structure simulating the fire test. The fire test simulates a fire on the aircraft from the propulsion system by using a burner with jet fuel exposing the component to a 2000 °F (1093°C) flame. The 2000 °F (1093°C) Flame is calibrated based on FAA Advisory Circular AC20-135.
Technical Paper

Effect of Surface Processes on High-Cycle Fatigue Life of Titanium Alloys

Abrasive blasting and chemical etching processes are often performed on titanium substrates to improve the adhesion performance of paints, coatings, and adhesives. Abrasive blasting and chemical etching processes alter the physical metallurgy of surfaces so they can produce varied and uncertain effects on the fatigue life of the substrate. The fatigue life of titanium subjected to various blasting intensities and etching has been determined and statistically analyzed. The results of this work indicate that, for titanium alloys, increased aluminum oxide abrasive blasting intensities decrease fatigue life and that chemical etching also decreases fatigue life.